Black mordant azo dye.



UNITED STATES PATENT oEEIoE.

AUGUST LEOPOLD LASKA OF OFFENBAOH-ONTHE-MAIN, GERMANY, ASSIGNOR TO GHEMISOHE FABRIK GRIESHEIM-E LEKTRON, OF FRANKFORT-ON-THE-MAIN, GER- MANY, A CORPORATlON.

BLACK MORDANT AZO DYE.

Specification of Letters Patent.

Patented Aug. 13, 1907.

Application filed March 22,1907. Serial No- 363,939-

strasse, Offenbach-on-the-Main, in the Grand Duchy of Hessen, Germany, have invented new and useful Improvements in Black Mordant Azo Dyestuffs, of which the following is a specification.

My invention relates to the production of new mordant monoazo dyestuffs which may be obtained by combining the diazo compounds of ortho-amidophenol bodies of the general formula 1 2 o rxxon. NH

wherein X and Y means Hf, CH Cl, N0 COOH and wherein that the same derivative contains no more than one NO group, with 2 :8 dioxynaphthalene 6 sulfoacid.

I have further found that the formation of the coloring matter best takes place in presence of slaked lime.

The thus obtained dyestuffs dye wool from acid bath bordeaux to black violet shades which, by subsequent treatment with chromates, are converted into violetblack to deep-black ones of excellent fastness to milling and potting process and against light.

The following example will show how the new coloring matter can be obtained; the parts being by weight: 35 8 parts of para-chloro-ortho-amidophenol are dissolved in 300 parts of water cooled with ice and diazotized by means of 17,3 parts of sodium nitrite. The diazo solution is poured into a solution of 60 parts of 2:8 dioxynaphthalene 6 sulfoacid in 600 parts of water, previously cooled with ice, and '7 5 parts of well slaked lime are added. The mixture is Well stirred till the formation of the dyestuff is completed, heated up to 70 C and the dyestuff precipitated by addition of a slight excess of hydrochloric acid, filtered off, dried and mixed with the necessary quantity of sodium carbonate as to form the sodium salt. The lime can be separated from the liquid in form of this carbonate by addition of sodium carbonate. From the filtered solution the dyestuff can be separated in the well known manner. It is a brown black powder dissolving in concentrated sulfuric acid to a blackish blue, in water to a reddish violet solution. This solution turns somewhat bluer by addi tion of caustic soda lye, and blue by addition of an excess of carbonate of sodium. The quantity of slaked lime may be varied within wide limits.

The dyestuffs from the diazo compounds of orthoamidophenol, its homologues and derivatives may be prepared in the same manner.

The tinctorial properties of a greater number of the new dyestuffs may be shown by the following table:

Dyes wool Dyestilt prcgparcld by comhnna ion 0 2:8 iox na thalcnc 6 sulionic ac id \x ith r diazotized From acid bath W i t h c h To mates:

Ortho-amidophenol Bordeaux Violet-black. Para-chloro-ortho -amidophenol. Dichloro ortho amidophe- Bordeaux Blue-black.

OI'IINI'I2ZClICl=1.2.4.6 Nitroamidophenol l 2 4 Bordeaux Deep-black 1 2 5 Greenish-black Chloroamidokresol Bordeaux l Violet-black l 2 4 6 Nitroamidokresol 1 2 4 6 Bluish bordeaux. Blue-black Nitroehloramidophenol 1 2 4 (S l Black violet Blue-black 1 2 6 4 Black vi 0 l e t Green-black brown Ortho amido para kresotinic acid:

iDHgIHZEHmCOGOH Bluishbordeaux. Violet-black N itroamido para oxybcnzoic acid ifllzNllyCfiOl'hlgO l Black-violet. Black Now what I claim and desire to secure by Letters Patent is the following: i

1. The process of manufacturing new mordant monoazo dyestuffs, which consists in combining the diazo compounds of ortho-amidophenol bodies of the general formula 1 2 C IIg vX. Y. OH NH where X and Y may be H. CH Cl, N0 COOH and wherein that one and the same derivative contains no more than one N0 group, with 21S dioxynaphthalene 6 sulfonic acid.

2. The process of manufacturing new mordant monoazo dyestuffs which consists in combining in presence of slnked lime the diazo compounds of ortho-amidophenol bodies of the general formula:

where X and Y may be H, CH Cl, N0 COOH and wherein that one and the same derivative contains no more than one N0 roup with 2 :S dioxynaphthalene 6 sulfo acid.

3. As a new article of manufacture the mordant monoazo dyestuffs obtained by combining the diazo compounds of ortho-amidophenol bodies of the general formula where X and Y may be H, CH Cl, NO: 00011 and Wherein that one and the same derivative contains no more than one NO: group with 21S dioxynaphthalene G sulfonic acid, heiugbrown black powders, soluble in concentrated sul- 1O furic acid to a hordeaux tn deep-violet solution, in water to a bordeaux to blue one, dyeing cotton from acid bath hordeaux to black-violet shades, which by subsequent treatme t with chromates, turn violet-black to deep black.

3 In testimony. that I claim the foregoing as my inven- 1 tion, I have signed my name in presence of two Witnesses,

I this seventh day of March 1007.

Witnesses EVA SATTLER,

l AUGUST LEOPOLD LASKA. HERMANN Wmn. 

